Thanks for the help Mike. Problems all sorted and I thought I'd share a couple of things to help future users.
1. Don't use Firefox for remote access, even using IE tab you lose functionality.
2. The full function of the system can only be tested by logging on from a remote location.
3. A useful microsoft guide for setting up and minor interface customizations is available
here
4. Failure of the WHS automatic router setup routine doesn't mean that remote access isn't functioning. I assumed that because the test was failing that my server remote access wouldn't work. When I tried to access it remotely it worked.
5. Can't remote access Vista Home Premium (my HTPC) via WHS. I have installed the RDP patch and can remote access it outside of WHS, but WHS recognises that its Home Premium and barrs RDP.
Love the way WHS works, particularly the remote access to files. I get amazing speeds uploading and downloading files remotely.